You just need to read the context. The one the Lord God of Israel raised up in a human, a prophet. The Lord God isn't Jesus. The Lord straight paths were prepared for is YHWH, not Jesus.
Luke 1
76And you, child, will be called
a prophet of the Most High;
for you will go on before the Lord
to prepare the way for Him,
Both.
Of course.
That isn't about the Father becoming a child.
This is about a human who needed time to learn to reject evil and choose God. Obviously that isn't God.
Isaiah 7
14Therefore the Lord Himself will give you a sign: Behold, the virgin will be with child and will give birth to a son, and will call Him
Immanuel. 15By the time He knows enough to reject evil and choose good, He will be eating curds and honey.
God wasn't manifest in the flesh. The earliest manuscripts don't say "God was manifest in the flesh." As such, most Bible say "he appeared in the flesh..." or something like that.
1 Timothy 3
16By common confession, the mystery of godliness is great:
He appeared in the flesh,
was vindicated by the Spirit,
was seen by angels,
was proclaimed among the nations,
was believed in throughout the world,
was taken up in glory.
In what sense? Did God become a man? No.
Yes.
Romans 10
13for, “Everyone who calls on the name of the Lord will be saved.”
No.